GraphDB

GraphDB is a graph database optimized for storing and querying RDF data. It is developed by Ontotext and is widely used for building knowledge graphs and data integration pipelines. GraphDB provides a native RDF store with a SPARQL endpoint and supports expressive reasoning over RDF schemas, including RDFS and OWL-based inferences. The database supports named graphs (contexts), which allows separation of data provenance and modular datasets within a single repository.

Key components include a triplestore engine, an indexing layer, a reasoning/derivation component, and a RESTful API plus a web-based user interface called GraphDB Workbench. It also offers import and export facilities for RDF formats such as Turtle and RDF/XML, and supports SPARQL 1.1 features including property paths, federated queries, and SPARQL Update.

GraphDB is distributed with different editions, including a free edition and commercial enterprise editions that add features such as clustering, scalability options, and advanced security controls. It is used for building knowledge graphs, data integration and governance, semantic search, and linked data applications across industries like publishing, life sciences, and manufacturing.

Overall, GraphDB is positioned as a mature RDF database with emphasis on semantic reasoning and data integration, backed by Ontotext's research and support ecosystem.